let obj={name:'bob',10:null,3:undefined,age:17};
let array=[1,2,3,4,5];
let string='imooc';

console.log(Object.keys(string),
			Object.keys(array),
			Object.keys(obj),
			Object.keys(123),
			Object.keys(true));

console.log(Object.values(string),
			Object.values(array),
			Object.values(obj),
			Object.values(123),
			Object.values(true));

console.log(Object.entries(string),
			Object.entries(array),
			Object.entries(obj),
			Object.entries(123),
			Object.entries(true));

array=Object.entries(array);
console.log(Object.fromEntries(array));
